Step 1: Create Layout

Step 2: Handling events for datagrid

This example uses 'onSelect' event to display the feed content and 'onLoadSuccess' event to select the first row.

Step 3: Handling events for tree

When tree data is loaded, we need to select the first leaf node, call 'select' method to select that node.
Use the 'onSelect' event to get the selected node, so we can get the corresponding 'url' value.
Finally we call 'load' method of datagrid to refresh the feed list data.